Odborné články

RMO - CLINICAL REVIEW - 2012

Forces Produced by Different Nonconventional Bracket or Ligature Systems...

Abstract

Objective: To analyze the forces released by four types of passive stainless steel self-ligating brackets (SLBs), and by two nonconventional elastomeric ligature-bracket systems when compared with conventional elastomeric ligatures on conventional stainless steel brackets during the alignment of apically displaced teeth at the maxillary arch.

Materials and Methods: An experimental model consisting of five brackets was used to assess the forces released by the seven different ligature-bracket systems with 0.012″ or 0.014″ superelastic nickel titanium wire in the presence of different amounts of apical displacement of the canine (ranging from 1.5 mm to 6 mm). Comparisons between the different types of bracket/wire/ ligature systems were carried out by means of ANOVA on ranks with Dunnett's post hoc test (P < .05).

Treatment of Class II malocclusion in adolescents has always relied on growth modification. The majority of treatment modalities, such as functional appliances, are directed at stopping or redirecting maxillary growth and simultaneously stimulating mandibular growth. On the other hand, in adult patients with severe Class II malocclusions, generally involving extremely deficient mandibles, orthognathic surgery is often the only possible treatment.

Treatment of Bimaxillary Protrusion Using Fiber-Reinforced Composite

VOLUME 41 : NUMBER 01 : PAGES (27-32) 2007

FLAVIO URIBE, DDS, MDS

RAVINDRA NANDA, BDS, MDS, PHD

Treatment of bimaxillary dentoalveolar protrusion often involves the extraction of four first premolars. Since these patients often have Class I molar relationships, the objective is usually to reduce the lip protrusion and correct the incisor inclinations with the least amount of anchorage loss. Although headgear has historically been the standard for maximum anchorage, its intermittent force application and requirement for patient compliance have led clinicians to search for alternative techniques, including mini-implants. In addition, various space-closure strategies have been used, including separate canine retraction, en masse anterior retraction, and differential-moment retraction.